3 years ago

I need help with number 5 :( pls help

Mathematics

1 answer:

jok3333 [9.3K]3 years ago

7 0

Answer:

the answer is c

Step-by-step explanation:

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Molly spends 5 hours a week in art class. How many minutes does she spend in art class every week?

vampirchik [111]

Answer:

she spends 300 minutes in art class a week

Step-by-step explanation:

5 x 60 is 300

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2 years ago

Find a linear second-order differential equation f(x, y, y', y'') = 0 for which y = c1x + c2x3 is a two-parameter family of solu

Alisiya [41]

Let $y=C_1x+C_2x^3=C_1y_1+C_2y_2$ . Then $y_1$ and $y_2$ are two fundamental, linearly independent solution that satisfy

$f(x,y_1,{y_1}',{y_1}'')=0$
$f(x,y_2,{y_2}',{y_2}'')=0$

Note that ${y_1}'=1$ , so that $x{y_1}'-y_1=0$ . Adding $y''$ doesn't change this, since ${y_1}''=0$ .

So if we suppose

$f(x,y,y',y'')=y''+xy'-y=0$

then substituting $y=y_2$ would give

$6x+x(3x^2)-x^3=6x+2x^3\neq0$

To make sure everything cancels out, multiply the second degree term by $-\dfrac{x^2}3$ , so that

$f(x,y,y',y'')=-\dfrac{x^2}3y''+xy'-y$

Then if $y=y_1+y_2$ , we get

$-\dfrac{x^2}3(0+6x)+x(1+3x^2)-(x+x^3)=-2x^3+x+3x^3-x-x^3=0$

as desired. So one possible ODE would be

$-\dfrac{x^2}3y''+xy'-y=0\iff x^2y''-3xy'+3y=0$

(See "Euler-Cauchy equation" for more info)

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3 years ago

Will brought 5 boxes of candy at the theater if each box of candy cost $ 2.30 and he paid with a twenty dollar bill how much cha

daser333 [38]

Answer:

8.50$

Step-by-step explanation:

5×2.3=11-5

20-11.5=8.5

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2 years ago

A circular playground force daycare center is to be covered with square tiles that are 9 inches on each side. The circle has a d

Luda [366]

You would need 9 boxes of tiles to cover it.

I hope this helps! :)

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3 years ago

Read 2 more answers

Refer to the figure at the right. Line a is parallel to line b

frosja888 [35]

Answer:

angle 9 = 55°

angle 7 = 145°

angle 3 = 35°

angle 4 = 55°

Step-by-step explanation:

Correct me if I'm wrong. I hope it helps.

3 0

2 years ago